Novak Djokovic also surpassed Rafael Nadal to make a record 77 Masters 1000 semi-final appearances.
Sinner will face 19-year-old Learner Tien for the title.
'The number one (ranking) is a goal that I had set myself almost at the beginning of the year and to see that I have achieved it is something incredible.'
Meanwhile, Sumit Nagal was trailing in his second round men's singles match against Holger Rune of Denmark, when rain led to a suspension of the contest.
Red Bull's Max Verstappen secured a dominant win from pole position in the Azerbaijan Grand Prix in Baku, leading the race from start to finish.
Norris had shown his pace in final practice when he became the third different driver to top the timesheets in the three sessions, punching out an impressive lap 0.345 faster than anyone else.
'I have no idea what's happening right now, I'm not in a dream, it's just crazy. I'm just so happy with my performance these past two weeks.'
'It is something that he always wanted to do and he has achieved phenomenal success in doing it.'
Japan staged a remarkable second-half comeback to defeat five-times world champions Brazil 3-2 in a friendly at a sold-out Tokyo Stadium on Tuesday.
With eight points on offer to the winner of Saturday's 100km race, he and Norris -- 22 points behind Piastri -- both have a good chance to reduce the gap to the Australian who was three tenths slower than his teammate.
Defending champion Jannik Sinner, who has been recovering from illness, received a more favourable route to the US Open final than Carlos Alcaraz while Aryna Sabalenka will be tested in her bid to retain her title after the draw was made on Thursday.
While Jannik Sinner and French Open champion Carlos Alcaraz have won the last seven major titles between them, the Italian cautioned against complacency and pointed to the strength of competition in the ATP Tour.
Tsitsipas made short work of Norwegian eighth seed Casper Ruud as he seized a third Monte Carlo Masters title in four years with a 6-1, 6-4 victory on Sunday.
Estevao and Rodrygo at the double as Brazil thrash South Korea 5-0
Max Verstappen seized pole position for Sunday's US Grand Prix while Formula One leader Oscar Piastri qualified sixth after a costly sprint race collision with his McLaren teammate Lando Norris.
US President Donald Trump received a mixed reception of cheers and boos at the US Open final at Arthur Ashe Stadium in New York on Sunday.
'It flows through families, caste groups, and local WhatsApp communities where trust is personal.' 'Children are taught to defer to elders, so if a parent or uncle forwards something, you don't question it.'
Norris last led the standings in April, a gap of 189 days, and had not won a race since Hungary in early August. Sunday was his sixth victory of the season, one less than Piastri, and career 10th.
United States President Donald Trump said he will file a $15 billion defamation and libel lawsuit against The New York Times, accusing the newspaper of running what he called a decades-long 'method of lying' against him, his family and the America First movement.
Piastri now leads Britain's Norris by 14 points with five rounds and two sprints remaining, while Verstappen has slashed his gap to the Australian to 40 after being 104 behind at the end of August.
Carlos Alcaraz has revealed the new cropped hairstyle he is sporting at the US Open was the result of his brother mishandling the clippers when he wanted a quick trim.
In the evening session, men's third seed Alexander Zverev and women's fourth seed Jessica Pegula were forced off the court mid-match due to rain and the threat of lightning.
India does not do trade agreements in a hurry or with a "gun to our head", Commerce and Industry Minister Piyush Goyal said on Friday. He said India is actively negotiating trade pacts with countries and regions, including the European Union (EU) and the US.
Dharambir and Atul win silver and bronze for India in World Para Athletics C'ships
Top seed and defending champion Jannik Sinner, playing on his 24th birthday, ended French qualifier Terence Atmane's dream run at the Cincinnati Open with a 7-6(4), 6-2 win on Saturday to reach the final of the US Open tune-up event.
Carlos Alcaraz said he could hold his head high despite being unseated from his Wimbledon throne by Jannik Sinner on Sunday and the Spaniard praised their hot rivalry for being several notches higher than the others on the men's tour.
Carlos Alcaraz proved a class above defending champion Jannik Sinner to win the men's singles title at the US Open with a 6-2, 3-6, 6-1, 6-4 victory at the Arthur Ashe stadium, in New York, on Sunday.
Both US Open champions share a fun connection off the court: They were born on the same day, May 5.
Jannik Sinner defeated Carlos Alcaraz in a high-octane final to claim his maiden Wimbledon trophy and fourth Grand Slam crown on Sunday.
Novak Djokovic became the oldest man to reach the quarter-finals at all four Grand Slams in a single season.
Sachin Tendulkar was snapped, flanked by 20-time Grand Slam champion Roger Federer and Bjorn Borg, who has won 11 majors.
IMAGES from football matches played across Europe on Sunday
Novak Djokovic felt unaffected by his recent losses to the top two players in the world, Carlos Alcaraz and Jannik Sinner, saying that while it is not ideal to lose big matches to the top talent regularly
Novak Djokovic outclassed American Taylor Fritz to set up a high-voltage semi-final showdown against Carlos Alcaraz.
Instead, Merryday called the filing "decidedly improper and impermissible," likening it more to a political screed than a legitimate legal complaint.
A Spanish court handed Brazil coach Carlo Ancelotti a one-year prison sentence for failing to pay tax on his image rights revenues in 2014 when the Italian was Real Madrid manager.
Japan, South Korea, Australia, Iran, Uzbekistan and Jordan have already taken six of Asia's eight guaranteed spots at next year's 48-team World Cup.
Carlos Alcaraz and Emma Raducanu are generating major excitement - not just for their upcoming mixed doubles debut at the US Open
The terrorists who carried out the deadly terror shooting attack at the Ramot Junction in Jerusalem used a makeshift "Carlo" submachine gun, otherwise known as a Carl Gustav.
Carlos Alcaraz heads to the US Open in his now-familiar role as chief challenger to defending champion Jannik Sinner and the Spaniard will be driven this year by the twin pursuit of Grand Slam glory and the World No. 1 ranking.
